/*! iScroll v5.1.3 ~ (c) 2008-2014 Matteo Spinelli ~ http://cubiq.org/license */
var scroll = module.exports = (function (window, document, Math) {
    var rAF = window.requestAnimationFrame  ||
        window.webkitRequestAnimationFrame  ||
        window.mozRequestAnimationFrame     ||
        window.oRequestAnimationFrame       ||
        window.msRequestAnimationFrame      ||
        function (callback) { window.setTimeout(callback, 1000 / 60); };

    var utils = (function () {
        /* !!! 原文件修改处 */
        var eutil = require("util");
        var me    = eutil.inheart(eutil);

    	var _elementStyle = document.createElement('div').style;
    	var _vendor = (function () {
    		var vendors = ['t', 'webkitT', 'MozT', 'msT', 'OT'],
    			transform,
    			i = 0,
    			l = vendors.length;

    		for ( ; i < l; i++ ) {
    			transform = vendors[i] + 'ransform';
    			if ( transform in _elementStyle ) return vendors[i].substr(0, vendors[i].length-1);
    		}

    		return false;
    	})();

    	function _prefixStyle (style) {
    		if ( _vendor === false ) return false;
    		if ( _vendor === '' ) return style;
    		return _vendor + style.charAt(0).toUpperCase() + style.substr(1);
    	}

    	me.addEvent = function (el, type, fn, capture) {
    		el.addEventListener(type, fn, !!capture);
    	};

    	me.removeEvent = function (el, type, fn, capture) {
    		el.removeEventListener(type, fn, !!capture);
    	};

    	me.prefixPointerEvent = function (pointerEvent) {
    		return window.MSPointerEvent ?
    			'MSPointer' + pointerEvent.charAt(7).toUpperCase() + pointerEvent.substr(8):
    			pointerEvent;
    	};

    	me.momentum = function (current, start, time, lowerMargin, wrapperSize, deceleration) {
    		var distance = current - start,
    			speed = Math.abs(distance) / time,
    			destination,
    			duration;

    		deceleration = deceleration === undefined ? 0.0006 : deceleration;

    		destination = current + ( speed * speed ) / ( 2 * deceleration ) * ( distance < 0 ? -1 : 1 );
    		duration = speed / deceleration;

    		if ( destination < lowerMargin ) {
    			destination = wrapperSize ? lowerMargin - ( wrapperSize / 2.5 * ( speed / 8 ) ) : lowerMargin;
    			distance = Math.abs(destination - current);
    			duration = distance / speed;
    		} else if ( destination > 0 ) {
    			destination = wrapperSize ? wrapperSize / 2.5 * ( speed / 8 ) : 0;
    			distance = Math.abs(current) + destination;
    			duration = distance / speed;
    		}

    		return {
    			destination: Math.round(destination),
    			duration: duration
    		};
    	};

    	var _transform = _prefixStyle('transform');

    	me.extend(me, {
    		hasTransform: _transform !== false,
    		hasPerspective: _prefixStyle('perspective') in _elementStyle,
    		hasTouch: 'ontouchstart' in window,
    		hasPointer: !!(window.PointerEvent || window.MSPointerEvent), // IE10 is prefixed
    		hasTransition: _prefixStyle('transition') in _elementStyle
    	});

    	/*
    	This should find all Android browsers lower than build 535.19 (both stock browser and webview)
    	- galaxy S2 is ok
        - 2.3.6 : `AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1`
        - 4.0.4 : `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
       - galaxy S3 is badAndroid (stock brower, webview)
         `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
       - galaxy S4 is badAndroid (stock brower, webview)
         `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
       - galaxy S5 is OK
         `AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36 (Chrome/)`
       - galaxy S6 is OK
         `AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36 (Chrome/)`
      */
    	me.isBadAndroid = (function() {
    		var appVersion = window.navigator.appVersion;
    		// Android browser is not a chrome browser.
    		if (/Android/.test(appVersion) && !(/Chrome\/\d/.test(appVersion))) {
    			var safariVersion = appVersion.match(/Safari\/(\d+.\d)/);
    			if(safariVersion && typeof safariVersion === "object" && safariVersion.length >= 2) {
    				return parseFloat(safariVersion[1]) < 535.19;
    			} else {
    				return true;
    			}
    		} else {
    			return false;
    		}
    	})();

    	me.extend(me.style = {}, {
    		transform: _transform,
    		transitionTimingFunction: _prefixStyle('transitionTimingFunction'),
    		transitionDuration: _prefixStyle('transitionDuration'),
    		transitionDelay: _prefixStyle('transitionDelay'),
    		transformOrigin: _prefixStyle('transformOrigin')
    	});

    	me.preventDefaultException = function (el, exceptions) {
    		for ( var i in exceptions ) {
    			if ( exceptions[i].test(el[i]) ) {
    				return true;
    			}
    		}

    		return false;
    	};

    	me.extend(me.eventType = {}, {
    		touchstart: 1,
    		touchmove: 1,
    		touchend: 1,

    		mousedown: 2,
    		mousemove: 2,
    		mouseup: 2,

    		pointerdown: 3,
    		pointermove: 3,
    		pointerup: 3,

    		MSPointerDown: 3,
    		MSPointerMove: 3,
    		MSPointerUp: 3
    	});

    	me.extend(me.ease = {}, {
    		quadratic: {
    			style: 'cubic-bezier(0.25, 0.46, 0.45, 0.94)',
    			fn: function (k) {
    				return k * ( 2 - k );
    			}
    		},
    		circular: {
    			style: 'cubic-bezier(0.1, 0.57, 0.1, 1)',	// Not properly "circular" but this looks better, it should be (0.075, 0.82, 0.165, 1)
    			fn: function (k) {
    				return Math.sqrt( 1 - ( --k * k ) );
    			}
    		},
    		back: {
    			style: 'cubic-bezier(0.175, 0.885, 0.32, 1.275)',
    			fn: function (k) {
    				var b = 4;
    				return ( k = k - 1 ) * k * ( ( b + 1 ) * k + b ) + 1;
    			}
    		},
    		bounce: {
    			style: '',
    			fn: function (k) {
    				if ( ( k /= 1 ) < ( 1 / 2.75 ) ) {
    					return 7.5625 * k * k;
    				} else if ( k < ( 2 / 2.75 ) ) {
    					return 7.5625 * ( k -= ( 1.5 / 2.75 ) ) * k + 0.75;
    				} else if ( k < ( 2.5 / 2.75 ) ) {
    					return 7.5625 * ( k -= ( 2.25 / 2.75 ) ) * k + 0.9375;
    				} else {
    					return 7.5625 * ( k -= ( 2.625 / 2.75 ) ) * k + 0.984375;
    				}
    			}
    		},
    		elastic: {
    			style: '',
    			fn: function (k) {
    				var f = 0.22,
    					e = 0.4;

    				if ( k === 0 ) { return 0; }
    				if ( k == 1 ) { return 1; }

    				return ( e * Math.pow( 2, - 10 * k ) * Math.sin( ( k - f / 4 ) * ( 2 * Math.PI ) / f ) + 1 );
    			}
    		}
    	});

    	me.tap = function (e, eventName) {
    		var ev = document.createEvent('Event');
    		ev.initEvent(eventName, true, true);
    		ev.pageX = e.pageX;
    		ev.pageY = e.pageY;
    		e.target.dispatchEvent(ev);
    	};

    	me.click = function (e) {
    		var target = e.target,
    			ev;

    		if ( !(/(SELECT|INPUT|TEXTAREA)/i).test(target.tagName) ) {
    			ev = document.createEvent('MouseEvents');
    			ev.initMouseEvent('click', true, true, e.view, 1,
    				target.screenX, target.screenY, target.clientX, target.clientY,
    				e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
    				0, null);

    			ev._constructed = true;
    			target.dispatchEvent(ev);
    		}
    	};

    	return me;
    })();

    function IScroll (el, options) {
    	this.wrapper = typeof el == 'string' ? document.querySelector(el) : el;
    	this.scroller = this.wrapper.children[0];
    	this.scrollerStyle = this.scroller.style;		// cache style for better performance

    	this.options = {

    		resizeScrollbars: true,

    		mouseWheelSpeed: 20,

    		snapThreshold: 0.334,

    // INSERT POINT: OPTIONS
    		disablePointer : !utils.hasPointer,
    		disableTouch : utils.hasPointer || !utils.hasTouch,
    		disableMouse : utils.hasPointer || utils.hasTouch,
    		startX: 0,
    		startY: 0,
    		scrollY: true,
    		directionLockThreshold: 5,
    		momentum: true,

    		bounce: true,
    		bounceTime: 600,
    		bounceEasing: '',

    		preventDefault: true,
    		preventDefaultException: { tagName: /^(INPUT|TEXTAREA|BUTTON|SELECT)$/ },

    		HWCompositing: true,
    		useTransition: true,
    		useTransform: true,
    		bindToWrapper: typeof window.onmousedown === "undefined"
    	};

    	for ( var i in options ) {
    		this.options[i] = options[i];
    	}

    	// Normalize options
    	this.translateZ = this.options.HWCompositing && utils.hasPerspective ? ' translateZ(0)' : '';

    	this.options.useTransition = utils.hasTransition && this.options.useTransition;
    	this.options.useTransform = utils.hasTransform && this.options.useTransform;

    	this.options.eventPassthrough = this.options.eventPassthrough === true ? 'vertical' : this.options.eventPassthrough;
    	this.options.preventDefault = !this.options.eventPassthrough && this.options.preventDefault;

    	// If you want eventPassthrough I have to lock one of the axes
    	this.options.scrollY = this.options.eventPassthrough == 'vertical' ? false : this.options.scrollY;
    	this.options.scrollX = this.options.eventPassthrough == 'horizontal' ? false : this.options.scrollX;

    	// With eventPassthrough we also need lockDirection mechanism
    	this.options.freeScroll = this.options.freeScroll && !this.options.eventPassthrough;
    	this.options.directionLockThreshold = this.options.eventPassthrough ? 0 : this.options.directionLockThreshold;

    	this.options.bounceEasing = typeof this.options.bounceEasing == 'string' ? utils.ease[this.options.bounceEasing] || utils.ease.circular : this.options.bounceEasing;

    	this.options.resizePolling = this.options.resizePolling === undefined ? 60 : this.options.resizePolling;

    	if ( this.options.tap === true ) {
    		this.options.tap = 'tap';
    	}

    	if ( this.options.shrinkScrollbars == 'scale' ) {
    		this.options.useTransition = false;
    	}

    	this.options.invertWheelDirection = this.options.invertWheelDirection ? -1 : 1;

    // INSERT POINT: NORMALIZATION

    	// Some defaults
    	this.x = 0;
    	this.y = 0;
    	this.directionX = 0;
    	this.directionY = 0;
    	this._events = {};

    // INSERT POINT: DEFAULTS

    	this._init();
    	this.refresh();

    	this.scrollTo(this.options.startX, this.options.startY);
    	this.enable();
    }

    IScroll.prototype = {
    	version: '5.2.0',

    	_init: function () {
    		this._initEvents();

    		if ( this.options.scrollbars || this.options.indicators ) {
    			this._initIndicators();
    		}

    		if ( this.options.mouseWheel ) {
    			this._initWheel();
    		}

    		if ( this.options.snap ) {
    			this._initSnap();
    		}

    		if ( this.options.keyBindings ) {
    			this._initKeys();
    		}

    // INSERT POINT: _init

    	},

    	destroy: function () {
    		this._initEvents(true);
    		clearTimeout(this.resizeTimeout);
     		this.resizeTimeout = null;
    		this._execEvent('destroy');
    	},

    	_transitionEnd: function (e) {
    		if ( e.target != this.scroller || !this.isInTransition ) {
    			return;
    		}

    		this._transitionTime();
    		if ( !this.resetPosition(this.options.bounceTime) ) {
    			this.isInTransition = false;
    			this._execEvent('scrollEnd');
    		}
    	},

    	_start: function (e) {
    		// React to left mouse button only
    		if ( utils.eventType[e.type] != 1 ) {
    		  // for button property
    		  // http://unixpapa.com/js/mouse.html
    		  var button;
    	    if (!e.which) {
    	      /* IE case */
    	      button = (e.button < 2) ? 0 :
    	               ((e.button == 4) ? 1 : 2);
    	    } else {
    	      /* All others */
    	      button = e.button;
    	    }
    			if ( button !== 0 ) {
    				return;
    			}
    		}

    		if ( !this.enabled || (this.initiated && utils.eventType[e.type] !== this.initiated) ) {
    			return;
    		}

    		if ( this.options.preventDefault && !utils.isBadAndroid && !utils.preventDefaultException(e.target, this.options.preventDefaultException) ) {
    			e.preventDefault();
    		}

    		var point = e.touches ? e.touches[0] : e,
    			pos;

    		this.initiated	= utils.eventType[e.type];
    		this.moved		= false;
    		this.distX		= 0;
    		this.distY		= 0;
    		this.directionX = 0;
    		this.directionY = 0;
    		this.directionLocked = 0;

    		this.startTime = utils.getTime();

    		if ( this.options.useTransition && this.isInTransition ) {
    			this._transitionTime();
    			this.isInTransition = false;
    			pos = this.getComputedPosition();
    			this._translate(Math.round(pos.x), Math.round(pos.y));
    			this._execEvent('scrollEnd');
    		} else if ( !this.options.useTransition && this.isAnimating ) {
    			this.isAnimating = false;
    			this._execEvent('scrollEnd');
    		}

    		this.startX    = this.x;
    		this.startY    = this.y;
    		this.absStartX = this.x;
    		this.absStartY = this.y;
    		this.pointX    = point.pageX;
    		this.pointY    = point.pageY;

    		this._execEvent('beforeScrollStart');
    	},

    	_move: function (e) {
    		if ( !this.enabled || utils.eventType[e.type] !== this.initiated ) {
    			return;
    		}

    		if ( this.options.preventDefault ) {	// increases performance on Android? TODO: check!
    			e.preventDefault();
    		}

    		var point		= e.touches ? e.touches[0] : e,
    			deltaX		= point.pageX - this.pointX,
    			deltaY		= point.pageY - this.pointY,
    			timestamp	= utils.getTime(),
    			newX, newY,
    			absDistX, absDistY;

    		this.pointX		= point.pageX;
    		this.pointY		= point.pageY;

    		this.distX		+= deltaX;
    		this.distY		+= deltaY;
    		absDistX		= Math.abs(this.distX);
    		absDistY		= Math.abs(this.distY);

    		// We need to move at least 10 pixels for the scrolling to initiate
    		if ( timestamp - this.endTime > 300 && (absDistX < 10 && absDistY < 10) ) {
    			return;
    		}

    		// If you are scrolling in one direction lock the other
    		if ( !this.directionLocked && !this.options.freeScroll ) {
    			if ( absDistX > absDistY + this.options.directionLockThreshold ) {
    				this.directionLocked = 'h';		// lock horizontally
    			} else if ( absDistY >= absDistX + this.options.directionLockThreshold ) {
    				this.directionLocked = 'v';		// lock vertically
    			} else {
    				this.directionLocked = 'n';		// no lock
    			}
    		}

    		if ( this.directionLocked == 'h' ) {
    			if ( this.options.eventPassthrough == 'vertical' ) {
    				e.preventDefault();
    			} else if ( this.options.eventPassthrough == 'horizontal' ) {
    				this.initiated = false;
    				return;
    			}

    			deltaY = 0;
    		} else if ( this.directionLocked == 'v' ) {
    			if ( this.options.eventPassthrough == 'horizontal' ) {
    				e.preventDefault();
    			} else if ( this.options.eventPassthrough == 'vertical' ) {
    				this.initiated = false;
    				return;
    			}

    			deltaX = 0;
    		}

    		deltaX = this.hasHorizontalScroll ? deltaX : 0;
    		deltaY = this.hasVerticalScroll ? deltaY : 0;

    		newX = this.x + deltaX;
    		newY = this.y + deltaY;

    		// Slow down if outside of the boundaries
    		if ( newX > 0 || newX < this.maxScrollX ) {
    			newX = this.options.bounce ? this.x + deltaX / 3 : newX > 0 ? 0 : this.maxScrollX;
    		}
    		if ( newY > 0 || newY < this.maxScrollY ) {
    			newY = this.options.bounce ? this.y + deltaY / 3 : newY > 0 ? 0 : this.maxScrollY;
    		}

    		this.directionX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
    		this.directionY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;

    		if ( !this.moved ) {
    			this._execEvent('scrollStart');
    		}

    		this.moved = true;

    		this._translate(newX, newY);

    /* REPLACE START: _move */

    		if ( timestamp - this.startTime > 300 ) {
    			this.startTime = timestamp;
    			this.startX = this.x;
    			this.startY = this.y;
    		}

    /* REPLACE END: _move */

    	},

    	_end: function (e) {
    		if ( !this.enabled || utils.eventType[e.type] !== this.initiated ) {
    			return;
    		}

    		if ( this.options.preventDefault && !utils.preventDefaultException(e.target, this.options.preventDefaultException) ) {
    			e.preventDefault();
    		}

    		var point = e.changedTouches ? e.changedTouches[0] : e,
    			momentumX,
    			momentumY,
    			duration = utils.getTime() - this.startTime,
    			newX = Math.round(this.x),
    			newY = Math.round(this.y),
    			distanceX = Math.abs(newX - this.startX),
    			distanceY = Math.abs(newY - this.startY),
    			time = 0,
    			easing = '';

    		this.isInTransition = 0;
    		this.initiated = 0;
    		this.endTime = utils.getTime();

    		// reset if we are outside of the boundaries
    		if ( this.resetPosition(this.options.bounceTime) ) {
    			return;
    		}

    		this.scrollTo(newX, newY);	// ensures that the last position is rounded

    		// we scrolled less than 10 pixels
    		if ( !this.moved ) {
    			if ( this.options.tap ) {
    				utils.tap(e, this.options.tap);
    			}

    			if ( this.options.click ) {
    				utils.click(e);
    			}

    			this._execEvent('scrollCancel');
    			return;
    		}

    		if ( this._events.flick && duration < 200 && distanceX < 100 && distanceY < 100 ) {
    			this._execEvent('flick');
    			return;
    		}

    		// start momentum animation if needed
    		if ( this.options.momentum && duration < 300 ) {
    			momentumX = this.hasHorizontalScroll ? utils.momentum(this.x, this.startX, duration, this.maxScrollX, this.options.bounce ? this.wrapperWidth : 0, this.options.deceleration) : { destination: newX, duration: 0 };
    			momentumY = this.hasVerticalScroll ? utils.momentum(this.y, this.startY, duration, this.maxScrollY, this.options.bounce ? this.wrapperHeight : 0, this.options.deceleration) : { destination: newY, duration: 0 };
    			newX = momentumX.destination;
    			newY = momentumY.destination;
    			time = Math.max(momentumX.duration, momentumY.duration);
    			this.isInTransition = 1;
    		}


    		if ( this.options.snap ) {
    			var snap = this._nearestSnap(newX, newY);
    			this.currentPage = snap;
    			time = this.options.snapSpeed || Math.max(
    					Math.max(
    						Math.min(Math.abs(newX - snap.x), 1000),
    						Math.min(Math.abs(newY - snap.y), 1000)
    					), 300);
    			newX = snap.x;
    			newY = snap.y;

    			this.directionX = 0;
    			this.directionY = 0;
    			easing = this.options.bounceEasing;
    		}

    // INSERT POINT: _end

    		if ( newX != this.x || newY != this.y ) {
    			// change easing function when scroller goes out of the boundaries
    			if ( newX > 0 || newX < this.maxScrollX || newY > 0 || newY < this.maxScrollY ) {
    				easing = utils.ease.quadratic;
    			}

    			this.scrollTo(newX, newY, time, easing);
    			return;
    		}

    		this._execEvent('scrollEnd');
    	},

    	_resize: function () {
    		var that = this;

    		clearTimeout(this.resizeTimeout);

    		this.resizeTimeout = setTimeout(function () {
    			that.refresh();
    		}, this.options.resizePolling);
    	},

    	resetPosition: function (time) {
    		var x = this.x,
    			y = this.y;

    		time = time || 0;

    		if ( !this.hasHorizontalScroll || this.x > 0 ) {
    			x = 0;
    		} else if ( this.x < this.maxScrollX ) {
    			x = this.maxScrollX;
    		}

    		if ( !this.hasVerticalScroll || this.y > 0 ) {
    			y = 0;
    		} else if ( this.y < this.maxScrollY ) {
    			y = this.maxScrollY;
    		}

    		if ( x == this.x && y == this.y ) {
    			return false;
    		}

    		this.scrollTo(x, y, time, this.options.bounceEasing);

    		return true;
    	},

    	disable: function () {
    		this.enabled = false;
    	},

    	enable: function () {
    		this.enabled = true;
    	},

    	refresh: function () {
    		var rf = this.wrapper.offsetHeight;		// Force reflow

    		this.wrapperWidth	= this.wrapper.clientWidth;
    		this.wrapperHeight	= this.wrapper.clientHeight;

    /* REPLACE START: refresh */

    		this.scrollerWidth	= this.scroller.offsetWidth;
    		this.scrollerHeight	= this.scroller.offsetHeight;

    		this.maxScrollX		= this.wrapperWidth - this.scrollerWidth;
    		this.maxScrollY		= this.wrapperHeight - this.scrollerHeight;

    /* REPLACE END: refresh */

    		this.hasHorizontalScroll	= this.options.scrollX && this.maxScrollX < 0;
    		this.hasVerticalScroll		= this.options.scrollY && this.maxScrollY < 0;

    		if ( !this.hasHorizontalScroll ) {
    			this.maxScrollX = 0;
    			this.scrollerWidth = this.wrapperWidth;
    		}

    		if ( !this.hasVerticalScroll ) {
    			this.maxScrollY = 0;
    			this.scrollerHeight = this.wrapperHeight;
    		}

    		this.endTime = 0;
    		this.directionX = 0;
    		this.directionY = 0;

    		this.wrapperOffset = utils.offset(this.wrapper);

    		this._execEvent('refresh');

    		this.resetPosition();

    // INSERT POINT: _refresh

    	},

    	on: function (type, fn) {
    		if ( !this._events[type] ) {
    			this._events[type] = [];
    		}

    		this._events[type].push(fn);
    	},

    	off: function (type, fn) {
    		if ( !this._events[type] ) {
    			return;
    		}

    		var index = this._events[type].indexOf(fn);

    		if ( index > -1 ) {
    			this._events[type].splice(index, 1);
    		}
    	},

    	_execEvent: function (type) {
    		if ( !this._events[type] ) {
    			return;
    		}

    		var i = 0,
    			l = this._events[type].length;

    		if ( !l ) {
    			return;
    		}

    		for ( ; i < l; i++ ) {
    			this._events[type][i].apply(this, [].slice.call(arguments, 1));
    		}
    	},

    	scrollBy: function (x, y, time, easing) {
    		x = this.x + x;
    		y = this.y + y;
    		time = time || 0;

    		this.scrollTo(x, y, time, easing);
    	},

    	scrollTo: function (x, y, time, easing) {
    		easing = easing || utils.ease.circular;

    		this.isInTransition = this.options.useTransition && time > 0;
    		var transitionType = this.options.useTransition && easing.style;
    		if ( !time || transitionType ) {
    				if(transitionType) {
    					this._transitionTimingFunction(easing.style);
    					this._transitionTime(time);
    				}
    			this._translate(x, y);
    		} else {
    			this._animate(x, y, time, easing.fn);
    		}
    	},

    	scrollToElement: function (el, time, offsetX, offsetY, easing) {
    		el = el.nodeType ? el : this.scroller.querySelector(el);

    		if ( !el ) {
    			return;
    		}

    		var pos = utils.offset(el);

    		pos.left -= this.wrapperOffset.left;
    		pos.top  -= this.wrapperOffset.top;

    		// if offsetX/Y are true we center the element to the screen
    		if ( offsetX === true ) {
    			offsetX = Math.round(el.offsetWidth / 2 - this.wrapper.offsetWidth / 2);
    		}
    		if ( offsetY === true ) {
    			offsetY = Math.round(el.offsetHeight / 2 - this.wrapper.offsetHeight / 2);
    		}

    		pos.left -= offsetX || 0;
    		pos.top  -= offsetY || 0;

    		pos.left = pos.left > 0 ? 0 : pos.left < this.maxScrollX ? this.maxScrollX : pos.left;
    		pos.top  = pos.top  > 0 ? 0 : pos.top  < this.maxScrollY ? this.maxScrollY : pos.top;

    		time = time === undefined || time === null || time === 'auto' ? Math.max(Math.abs(this.x-pos.left), Math.abs(this.y-pos.top)) : time;

    		this.scrollTo(pos.left, pos.top, time, easing);
    	},

    	_transitionTime: function (time) {
    		time = time || 0;

    		var durationProp = utils.style.transitionDuration;
    		this.scrollerStyle[durationProp] = time + 'ms';

    		if ( !time && utils.isBadAndroid ) {
    			this.scrollerStyle[durationProp] = '0.0001ms';
    			// remove 0.0001ms
    			var self = this;
    			rAF(function() {
    				if(self.scrollerStyle[durationProp] === '0.0001ms') {
    					self.scrollerStyle[durationProp] = '0s';
    				}
    			});
    		}


    		if ( this.indicators ) {
    			for ( var i = this.indicators.length; i--; ) {
    				this.indicators[i].transitionTime(time);
    			}
    		}


    // INSERT POINT: _transitionTime

    	},

    	_transitionTimingFunction: function (easing) {
    		this.scrollerStyle[utils.style.transitionTimingFunction] = easing;


    		if ( this.indicators ) {
    			for ( var i = this.indicators.length; i--; ) {
    				this.indicators[i].transitionTimingFunction(easing);
    			}
    		}


    // INSERT POINT: _transitionTimingFunction

    	},

    	_translate: function (x, y) {
    		if ( this.options.useTransform ) {

    /* REPLACE START: _translate */

    			this.scrollerStyle[utils.style.transform] = 'translate(' + x + 'px,' + y + 'px)' + this.translateZ;

    /* REPLACE END: _translate */

    		} else {
    			x = Math.round(x);
    			y = Math.round(y);
    			this.scrollerStyle.left = x + 'px';
    			this.scrollerStyle.top = y + 'px';
    		}

    		this.x = x;
    		this.y = y;


    	if ( this.indicators ) {
    		for ( var i = this.indicators.length; i--; ) {
    			this.indicators[i].updatePosition();
    		}
    	}


    // INSERT POINT: _translate

    	},

    	_initEvents: function (remove) {
    		var eventType = remove ? utils.removeEvent : utils.addEvent,
    			target = this.options.bindToWrapper ? this.wrapper : window;

    		eventType(window, 'orientationchange', this);
    		eventType(window, 'resize', this);

    		if ( this.options.click ) {
    			eventType(this.wrapper, 'click', this, true);
    		}

    		if ( !this.options.disableMouse ) {
    			eventType(this.wrapper, 'mousedown', this);
    			eventType(target, 'mousemove', this);
    			eventType(target, 'mousecancel', this);
    			eventType(target, 'mouseup', this);
    		}

    		if ( utils.hasPointer && !this.options.disablePointer ) {
    			eventType(this.wrapper, utils.prefixPointerEvent('pointerdown'), this);
    			eventType(target, utils.prefixPointerEvent('pointermove'), this);
    			eventType(target, utils.prefixPointerEvent('pointercancel'), this);
    			eventType(target, utils.prefixPointerEvent('pointerup'), this);
    		}

    		if ( utils.hasTouch && !this.options.disableTouch ) {
    			eventType(this.wrapper, 'touchstart', this);
    			eventType(target, 'touchmove', this);
    			eventType(target, 'touchcancel', this);
    			eventType(target, 'touchend', this);
    		}

    		eventType(this.scroller, 'transitionend', this);
    		eventType(this.scroller, 'webkitTransitionEnd', this);
    		eventType(this.scroller, 'oTransitionEnd', this);
    		eventType(this.scroller, 'MSTransitionEnd', this);
    	},

    	getComputedPosition: function () {
    		var matrix = window.getComputedStyle(this.scroller, null),
    			x, y;

    		if ( this.options.useTransform ) {
    			matrix = matrix[utils.style.transform].split(')')[0].split(', ');
    			x = +(matrix[12] || matrix[4]);
    			y = +(matrix[13] || matrix[5]);
    		} else {
    			x = +matrix.left.replace(/[^-\d.]/g, '');
    			y = +matrix.top.replace(/[^-\d.]/g, '');
    		}

    		return { x: x, y: y };
    	},
    	_initIndicators: function () {
    		var interactive = this.options.interactiveScrollbars,
    			customStyle = typeof this.options.scrollbars != 'string',
    			indicators = [],
    			indicator;

    		var that = this;

    		this.indicators = [];

    		if ( this.options.scrollbars ) {
    			// Vertical scrollbar
    			if ( this.options.scrollY ) {
    				indicator = {
    					el: createDefaultScrollbar('v', interactive, this.options.scrollbars),
    					interactive: interactive,
    					defaultScrollbars: true,
    					customStyle: customStyle,
    					resize: this.options.resizeScrollbars,
    					shrink: this.options.shrinkScrollbars,
    					fade: this.options.fadeScrollbars,
    					listenX: false
    				};

    				this.wrapper.appendChild(indicator.el);
    				indicators.push(indicator);
    			}

    			// Horizontal scrollbar
    			if ( this.options.scrollX ) {
    				indicator = {
    					el: createDefaultScrollbar('h', interactive, this.options.scrollbars),
    					interactive: interactive,
    					defaultScrollbars: true,
    					customStyle: customStyle,
    					resize: this.options.resizeScrollbars,
    					shrink: this.options.shrinkScrollbars,
    					fade: this.options.fadeScrollbars,
    					listenY: false
    				};

    				this.wrapper.appendChild(indicator.el);
    				indicators.push(indicator);
    			}
    		}

    		if ( this.options.indicators ) {
    			// TODO: check concat compatibility
    			indicators = indicators.concat(this.options.indicators);
    		}

    		for ( var i = indicators.length; i--; ) {
    			this.indicators.push( new Indicator(this, indicators[i]) );
    		}

    		// TODO: check if we can use array.map (wide compatibility and performance issues)
    		function _indicatorsMap (fn) {
    			if (that.indicators) {
    				for ( var i = that.indicators.length; i--; ) {
    					fn.call(that.indicators[i]);
    				}
    			}
    		}

    		if ( this.options.fadeScrollbars ) {
    			this.on('scrollEnd', function () {
    				_indicatorsMap(function () {
    					this.fade();
    				});
    			});

    			this.on('scrollCancel', function () {
    				_indicatorsMap(function () {
    					this.fade();
    				});
    			});

    			this.on('scrollStart', function () {
    				_indicatorsMap(function () {
    					this.fade(1);
    				});
    			});

    			this.on('beforeScrollStart', function () {
    				_indicatorsMap(function () {
    					this.fade(1, true);
    				});
    			});
    		}


    		this.on('refresh', function () {
    			_indicatorsMap(function () {
    				this.refresh();
    			});
    		});

    		this.on('destroy', function () {
    			_indicatorsMap(function () {
    				this.destroy();
    			});

    			delete this.indicators;
    		});
    	},

    	_initWheel: function () {
    		utils.addEvent(this.wrapper, 'wheel', this);
    		utils.addEvent(this.wrapper, 'mousewheel', this);
    		utils.addEvent(this.wrapper, 'DOMMouseScroll', this);

    		this.on('destroy', function () {
    			clearTimeout(this.wheelTimeout);
    			this.wheelTimeout = null;
    			utils.removeEvent(this.wrapper, 'wheel', this);
    			utils.removeEvent(this.wrapper, 'mousewheel', this);
    			utils.removeEvent(this.wrapper, 'DOMMouseScroll', this);
    		});
    	},

    	_wheel: function (e) {
    		if ( !this.enabled ) {
    			return;
    		}

    		e.preventDefault();

    		var wheelDeltaX, wheelDeltaY,
    			newX, newY,
    			that = this;

    		if ( this.wheelTimeout === undefined ) {
    			that._execEvent('scrollStart');
    		}

    		// Execute the scrollEnd event after 400ms the wheel stopped scrolling
    		clearTimeout(this.wheelTimeout);
    		this.wheelTimeout = setTimeout(function () {
    			if(!that.options.snap) {
    				that._execEvent('scrollEnd');
    			}
    			that.wheelTimeout = undefined;
    		}, 400);

    		if ( 'deltaX' in e ) {
    			if (e.deltaMode === 1) {
    				wheelDeltaX = -e.deltaX * this.options.mouseWheelSpeed;
    				wheelDeltaY = -e.deltaY * this.options.mouseWheelSpeed;
    			} else {
    				wheelDeltaX = -e.deltaX;
    				wheelDeltaY = -e.deltaY;
    			}
    		} else if ( 'wheelDeltaX' in e ) {
    			wheelDeltaX = e.wheelDeltaX / 120 * this.options.mouseWheelSpeed;
    			wheelDeltaY = e.wheelDeltaY / 120 * this.options.mouseWheelSpeed;
    		} else if ( 'wheelDelta' in e ) {
    			wheelDeltaX = wheelDeltaY = e.wheelDelta / 120 * this.options.mouseWheelSpeed;
    		} else if ( 'detail' in e ) {
    			wheelDeltaX = wheelDeltaY = -e.detail / 3 * this.options.mouseWheelSpeed;
    		} else {
    			return;
    		}

    		wheelDeltaX *= this.options.invertWheelDirection;
    		wheelDeltaY *= this.options.invertWheelDirection;

    		if ( !this.hasVerticalScroll ) {
    			wheelDeltaX = wheelDeltaY;
    			wheelDeltaY = 0;
    		}

    		if ( this.options.snap ) {
    			newX = this.currentPage.pageX;
    			newY = this.currentPage.pageY;

    			if ( wheelDeltaX > 0 ) {
    				newX--;
    			} else if ( wheelDeltaX < 0 ) {
    				newX++;
    			}

    			if ( wheelDeltaY > 0 ) {
    				newY--;
    			} else if ( wheelDeltaY < 0 ) {
    				newY++;
    			}

    			this.goToPage(newX, newY);

    			return;
    		}

    		newX = this.x + Math.round(this.hasHorizontalScroll ? wheelDeltaX : 0);
    		newY = this.y + Math.round(this.hasVerticalScroll ? wheelDeltaY : 0);

    		this.directionX = wheelDeltaX > 0 ? -1 : wheelDeltaX < 0 ? 1 : 0;
    		this.directionY = wheelDeltaY > 0 ? -1 : wheelDeltaY < 0 ? 1 : 0;

    		if ( newX > 0 ) {
    			newX = 0;
    		} else if ( newX < this.maxScrollX ) {
    			newX = this.maxScrollX;
    		}

    		if ( newY > 0 ) {
    			newY = 0;
    		} else if ( newY < this.maxScrollY ) {
    			newY = this.maxScrollY;
    		}

    		this.scrollTo(newX, newY, 0);

    // INSERT POINT: _wheel
    	},

    	_initSnap: function () {
    		this.currentPage = {};

    		if ( typeof this.options.snap == 'string' ) {
    			this.options.snap = this.scroller.querySelectorAll(this.options.snap);
    		}

    		this.on('refresh', function () {
    			var i = 0, l,
    				m = 0, n,
    				cx, cy,
    				x = 0, y,
    				stepX = this.options.snapStepX || this.wrapperWidth,
    				stepY = this.options.snapStepY || this.wrapperHeight,
    				el;

    			this.pages = [];

    			if ( !this.wrapperWidth || !this.wrapperHeight || !this.scrollerWidth || !this.scrollerHeight ) {
    				return;
    			}

    			if ( this.options.snap === true ) {
    				cx = Math.round( stepX / 2 );
    				cy = Math.round( stepY / 2 );

    				while ( x > -this.scrollerWidth ) {
    					this.pages[i] = [];
    					l = 0;
    					y = 0;

    					while ( y > -this.scrollerHeight ) {
    						this.pages[i][l] = {
    							x: Math.max(x, this.maxScrollX),
    							y: Math.max(y, this.maxScrollY),
    							width: stepX,
    							height: stepY,
    							cx: x - cx,
    							cy: y - cy
    						};

    						y -= stepY;
    						l++;
    					}

    					x -= stepX;
    					i++;
    				}
    			} else {
    				el = this.options.snap;
    				l = el.length;
    				n = -1;

    				for ( ; i < l; i++ ) {
    					if ( i === 0 || el[i].offsetLeft <= el[i-1].offsetLeft ) {
    						m = 0;
    						n++;
    					}

    					if ( !this.pages[m] ) {
    						this.pages[m] = [];
    					}

    					x = Math.max(-el[i].offsetLeft, this.maxScrollX);
    					y = Math.max(-el[i].offsetTop, this.maxScrollY);
    					cx = x - Math.round(el[i].offsetWidth / 2);
    					cy = y - Math.round(el[i].offsetHeight / 2);

    					this.pages[m][n] = {
    						x: x,
    						y: y,
    						width: el[i].offsetWidth,
    						height: el[i].offsetHeight,
    						cx: cx,
    						cy: cy
    					};

    					if ( x > this.maxScrollX ) {
    						m++;
    					}
    				}
    			}

    			this.goToPage(this.currentPage.pageX || 0, this.currentPage.pageY || 0, 0);

    			// Update snap threshold if needed
    			if ( this.options.snapThreshold % 1 === 0 ) {
    				this.snapThresholdX = this.options.snapThreshold;
    				this.snapThresholdY = this.options.snapThreshold;
    			} else {
    				this.snapThresholdX = Math.round(this.pages[this.currentPage.pageX][this.currentPage.pageY].width * this.options.snapThreshold);
    				this.snapThresholdY = Math.round(this.pages[this.currentPage.pageX][this.currentPage.pageY].height * this.options.snapThreshold);
    			}
    		});

    		this.on('flick', function () {
    			var time = this.options.snapSpeed || Math.max(
    					Math.max(
    						Math.min(Math.abs(this.x - this.startX), 1000),
    						Math.min(Math.abs(this.y - this.startY), 1000)
    					), 300);

    			this.goToPage(
    				this.currentPage.pageX + this.directionX,
    				this.currentPage.pageY + this.directionY,
    				time
    			);
    		});
    	},

    	_nearestSnap: function (x, y) {
    		if ( !this.pages.length ) {
    			return { x: 0, y: 0, pageX: 0, pageY: 0 };
    		}

    		var i = 0,
    			l = this.pages.length,
    			m = 0;

    		// Check if we exceeded the snap threshold
    		if ( Math.abs(x - this.absStartX) < this.snapThresholdX &&
    			Math.abs(y - this.absStartY) < this.snapThresholdY ) {
    			return this.currentPage;
    		}

    		if ( x > 0 ) {
    			x = 0;
    		} else if ( x < this.maxScrollX ) {
    			x = this.maxScrollX;
    		}

    		if ( y > 0 ) {
    			y = 0;
    		} else if ( y < this.maxScrollY ) {
    			y = this.maxScrollY;
    		}

    		for ( ; i < l; i++ ) {
    			if ( x >= this.pages[i][0].cx ) {
    				x = this.pages[i][0].x;
    				break;
    			}
    		}

    		l = this.pages[i].length;

    		for ( ; m < l; m++ ) {
    			if ( y >= this.pages[0][m].cy ) {
    				y = this.pages[0][m].y;
    				break;
    			}
    		}

    		if ( i == this.currentPage.pageX ) {
    			i += this.directionX;

    			if ( i < 0 ) {
    				i = 0;
    			} else if ( i >= this.pages.length ) {
    				i = this.pages.length - 1;
    			}

    			x = this.pages[i][0].x;
    		}

    		if ( m == this.currentPage.pageY ) {
    			m += this.directionY;

    			if ( m < 0 ) {
    				m = 0;
    			} else if ( m >= this.pages[0].length ) {
    				m = this.pages[0].length - 1;
    			}

    			y = this.pages[0][m].y;
    		}

    		return {
    			x: x,
    			y: y,
    			pageX: i,
    			pageY: m
    		};
    	},

    	goToPage: function (x, y, time, easing) {
    		easing = easing || this.options.bounceEasing;

            /* !!! 原文修改开始 =================== */
            if (!this.pages.length) {
                this.refresh();
            }
            // 刷新后还无值，退出执行
            if (!this.pages.length) return;
            /* !!! 原文修改结束 =================== */

    		if ( x >= this.pages.length ) {
    			x = this.pages.length - 1;
    		} else if ( x < 0 ) {
    			x = 0;
    		}

    		if ( y >= this.pages[x].length ) {
    			y = this.pages[x].length - 1;
    		} else if ( y < 0 ) {
    			y = 0;
    		}

    		var posX = this.pages[x][y].x,
    			posY = this.pages[x][y].y;

    		time = time === undefined ? this.options.snapSpeed || Math.max(
    			Math.max(
    				Math.min(Math.abs(posX - this.x), 1000),
    				Math.min(Math.abs(posY - this.y), 1000)
    			), 300) : time;

    		this.currentPage = {
    			x: posX,
    			y: posY,
    			pageX: x,
    			pageY: y
    		};

    		this.scrollTo(posX, posY, time, easing);
    	},

    	next: function (time, easing) {
    		var x = this.currentPage.pageX,
    			y = this.currentPage.pageY;

    		x++;

    		if ( x >= this.pages.length && this.hasVerticalScroll ) {
    			x = 0;
    			y++;
    		}

    		this.goToPage(x, y, time, easing);
    	},

    	prev: function (time, easing) {
    		var x = this.currentPage.pageX,
    			y = this.currentPage.pageY;

    		x--;

    		if ( x < 0 && this.hasVerticalScroll ) {
    			x = 0;
    			y--;
    		}

    		this.goToPage(x, y, time, easing);
    	},

    	_initKeys: function (e) {
    		// default key bindings
    		var keys = {
    			pageUp: 33,
    			pageDown: 34,
    			end: 35,
    			home: 36,
    			left: 37,
    			up: 38,
    			right: 39,
    			down: 40
    		};
    		var i;

    		// if you give me characters I give you keycode
    		if ( typeof this.options.keyBindings == 'object' ) {
    			for ( i in this.options.keyBindings ) {
    				if ( typeof this.options.keyBindings[i] == 'string' ) {
    					this.options.keyBindings[i] = this.options.keyBindings[i].toUpperCase().charCodeAt(0);
    				}
    			}
    		} else {
    			this.options.keyBindings = {};
    		}

    		for ( i in keys ) {
    			this.options.keyBindings[i] = this.options.keyBindings[i] || keys[i];
    		}

    		utils.addEvent(window, 'keydown', this);

    		this.on('destroy', function () {
    			utils.removeEvent(window, 'keydown', this);
    		});
    	},

    	_key: function (e) {
    		if ( !this.enabled ) {
    			return;
    		}

    		var snap = this.options.snap,	// we are using this alot, better to cache it
    			newX = snap ? this.currentPage.pageX : this.x,
    			newY = snap ? this.currentPage.pageY : this.y,
    			now = utils.getTime(),
    			prevTime = this.keyTime || 0,
    			acceleration = 0.250,
    			pos;

    		if ( this.options.useTransition && this.isInTransition ) {
    			pos = this.getComputedPosition();

    			this._translate(Math.round(pos.x), Math.round(pos.y));
    			this.isInTransition = false;
    		}

    		this.keyAcceleration = now - prevTime < 200 ? Math.min(this.keyAcceleration + acceleration, 50) : 0;

    		switch ( e.keyCode ) {
    			case this.options.keyBindings.pageUp:
    				if ( this.hasHorizontalScroll && !this.hasVerticalScroll ) {
    					newX += snap ? 1 : this.wrapperWidth;
    				} else {
    					newY += snap ? 1 : this.wrapperHeight;
    				}
    				break;
    			case this.options.keyBindings.pageDown:
    				if ( this.hasHorizontalScroll && !this.hasVerticalScroll ) {
    					newX -= snap ? 1 : this.wrapperWidth;
    				} else {
    					newY -= snap ? 1 : this.wrapperHeight;
    				}
    				break;
    			case this.options.keyBindings.end:
    				newX = snap ? this.pages.length-1 : this.maxScrollX;
    				newY = snap ? this.pages[0].length-1 : this.maxScrollY;
    				break;
    			case this.options.keyBindings.home:
    				newX = 0;
    				newY = 0;
    				break;
    			case this.options.keyBindings.left:
    				newX += snap ? -1 : 5 + this.keyAcceleration>>0;
    				break;
    			case this.options.keyBindings.up:
    				newY += snap ? 1 : 5 + this.keyAcceleration>>0;
    				break;
    			case this.options.keyBindings.right:
    				newX -= snap ? -1 : 5 + this.keyAcceleration>>0;
    				break;
    			case this.options.keyBindings.down:
    				newY -= snap ? 1 : 5 + this.keyAcceleration>>0;
    				break;
    			default:
    				return;
    		}

    		if ( snap ) {
    			this.goToPage(newX, newY);
    			return;
    		}

    		if ( newX > 0 ) {
    			newX = 0;
    			this.keyAcceleration = 0;
    		} else if ( newX < this.maxScrollX ) {
    			newX = this.maxScrollX;
    			this.keyAcceleration = 0;
    		}

    		if ( newY > 0 ) {
    			newY = 0;
    			this.keyAcceleration = 0;
    		} else if ( newY < this.maxScrollY ) {
    			newY = this.maxScrollY;
    			this.keyAcceleration = 0;
    		}

    		this.scrollTo(newX, newY, 0);

    		this.keyTime = now;
    	},

    	_animate: function (destX, destY, duration, easingFn) {
    		var that = this,
    			startX = this.x,
    			startY = this.y,
    			startTime = utils.getTime(),
    			destTime = startTime + duration;

    		function step () {
    			var now = utils.getTime(),
    				newX, newY,
    				easing;

    			if ( now >= destTime ) {
    				that.isAnimating = false;
    				that._translate(destX, destY);

    				if ( !that.resetPosition(that.options.bounceTime) ) {
    					that._execEvent('scrollEnd');
    				}

    				return;
    			}

    			now = ( now - startTime ) / duration;
    			easing = easingFn(now);
    			newX = ( destX - startX ) * easing + startX;
    			newY = ( destY - startY ) * easing + startY;
    			that._translate(newX, newY);

    			if ( that.isAnimating ) {
    				rAF(step);
    			}
    		}

    		this.isAnimating = true;
    		step();
    	},
    	handleEvent: function (e) {
    		switch ( e.type ) {
    			case 'touchstart':
    			case 'pointerdown':
    			case 'MSPointerDown':
    			case 'mousedown':
    				this._start(e);
    				break;
    			case 'touchmove':
    			case 'pointermove':
    			case 'MSPointerMove':
    			case 'mousemove':
    				this._move(e);
    				break;
    			case 'touchend':
    			case 'pointerup':
    			case 'MSPointerUp':
    			case 'mouseup':
    			case 'touchcancel':
    			case 'pointercancel':
    			case 'MSPointerCancel':
    			case 'mousecancel':
    				this._end(e);
    				break;
    			case 'orientationchange':
    			case 'resize':
    				this._resize();
    				break;
    			case 'transitionend':
    			case 'webkitTransitionEnd':
    			case 'oTransitionEnd':
    			case 'MSTransitionEnd':
    				this._transitionEnd(e);
    				break;
    			case 'wheel':
    			case 'DOMMouseScroll':
    			case 'mousewheel':
    				this._wheel(e);
    				break;
    			case 'keydown':
    				this._key(e);
    				break;
    			case 'click':
    				if ( this.enabled && !e._constructed ) {
    					e.preventDefault();
    					e.stopPropagation();
    				}
    				break;
    		}
    	}
    };
    function createDefaultScrollbar (direction, interactive, type) {
    	var scrollbar = document.createElement('div'),
    		indicator = document.createElement('div');

        /* !!! 修改开始 ===================== */
        indicator.className = 'iScrollIndicator';

        if ( direction == 'h' ) {
            if ( type === true ) {
                indicator.style.height = '100%';
            }
            scrollbar.className = 'iScrollHorizontalScrollbar';
        } else {
            if ( type === true ) {
                indicator.style.width = '100%';
            }
            scrollbar.className = 'iScrollVerticalScrollbar';
        }

        scrollbar.style.cssText += ';overflow:hidden';

    	if ( !interactive ) {
    		utils.addClass(scrollbar, "pointerNone");
    	}
        /* !!! 修改结束 ===================== */

    	scrollbar.appendChild(indicator);

    	return scrollbar;
    }

    function Indicator (scroller, options) {
    	this.wrapper = typeof options.el == 'string' ? document.querySelector(options.el) : options.el;
    	this.wrapperStyle = this.wrapper.style;
    	this.indicator = this.wrapper.children[0];
    	this.indicatorStyle = this.indicator.style;
    	this.scroller = scroller;

    	this.options = {
    		listenX: true,
    		listenY: true,
    		interactive: false,
    		resize: true,
    		defaultScrollbars: false,
    		shrink: false,
    		fade: false,
    		speedRatioX: 0,
    		speedRatioY: 0
    	};

    	for ( var i in options ) {
    		this.options[i] = options[i];
    	}

    	this.sizeRatioX = 1;
    	this.sizeRatioY = 1;
    	this.maxPosX = 0;
    	this.maxPosY = 0;

    	if ( this.options.interactive ) {
    		if ( !this.options.disableTouch ) {
    			utils.addEvent(this.indicator, 'touchstart', this);
    			utils.addEvent(window, 'touchend', this);
    		}
    		if ( !this.options.disablePointer ) {
    			utils.addEvent(this.indicator, utils.prefixPointerEvent('pointerdown'), this);
    			utils.addEvent(window, utils.prefixPointerEvent('pointerup'), this);
    		}
    		if ( !this.options.disableMouse ) {
    			utils.addEvent(this.indicator, 'mousedown', this);
    			utils.addEvent(window, 'mouseup', this);
    		}
    	}

    	if ( this.options.fade ) {
    		this.wrapperStyle[utils.style.transform] = this.scroller.translateZ;
    		var durationProp = utils.style.transitionDuration;
    		this.wrapperStyle[durationProp] = utils.isBadAndroid ? '0.0001ms' : '0ms';
    		// remove 0.0001ms
    		var self = this;
    		if(utils.isBadAndroid) {
    			rAF(function() {
    				if(self.wrapperStyle[durationProp] === '0.0001ms') {
    					self.wrapperStyle[durationProp] = '0s';
    				}
    			});
    		}
    		this.wrapperStyle.opacity = '0';
    	}
    }

    Indicator.prototype = {
    	handleEvent: function (e) {
    		switch ( e.type ) {
    			case 'touchstart':
    			case 'pointerdown':
    			case 'MSPointerDown':
    			case 'mousedown':
    				this._start(e);
    				break;
    			case 'touchmove':
    			case 'pointermove':
    			case 'MSPointerMove':
    			case 'mousemove':
    				this._move(e);
    				break;
    			case 'touchend':
    			case 'pointerup':
    			case 'MSPointerUp':
    			case 'mouseup':
    			case 'touchcancel':
    			case 'pointercancel':
    			case 'MSPointerCancel':
    			case 'mousecancel':
    				this._end(e);
    				break;
    		}
    	},

    	destroy: function () {
    		if ( this.options.fadeScrollbars ) {
    			clearTimeout(this.fadeTimeout);
    			this.fadeTimeout = null;
    		}
    		if ( this.options.interactive ) {
    			utils.removeEvent(this.indicator, 'touchstart', this);
    			utils.removeEvent(this.indicator, utils.prefixPointerEvent('pointerdown'), this);
    			utils.removeEvent(this.indicator, 'mousedown', this);

    			utils.removeEvent(window, 'touchmove', this);
    			utils.removeEvent(window, utils.prefixPointerEvent('pointermove'), this);
    			utils.removeEvent(window, 'mousemove', this);

    			utils.removeEvent(window, 'touchend', this);
    			utils.removeEvent(window, utils.prefixPointerEvent('pointerup'), this);
    			utils.removeEvent(window, 'mouseup', this);
    		}

    		if ( this.options.defaultScrollbars ) {
    			this.wrapper.parentNode.removeChild(this.wrapper);
    		}
    	},

    	_start: function (e) {
    		var point = e.touches ? e.touches[0] : e;

    		e.preventDefault();
    		e.stopPropagation();

    		this.transitionTime();

    		this.initiated = true;
    		this.moved = false;
    		this.lastPointX	= point.pageX;
    		this.lastPointY	= point.pageY;

    		this.startTime	= utils.getTime();

    		if ( !this.options.disableTouch ) {
    			utils.addEvent(window, 'touchmove', this);
    		}
    		if ( !this.options.disablePointer ) {
    			utils.addEvent(window, utils.prefixPointerEvent('pointermove'), this);
    		}
    		if ( !this.options.disableMouse ) {
    			utils.addEvent(window, 'mousemove', this);
    		}

    		this.scroller._execEvent('beforeScrollStart');
    	},

    	_move: function (e) {
    		var point = e.touches ? e.touches[0] : e,
    			deltaX, deltaY,
    			newX, newY,
    			timestamp = utils.getTime();

    		if ( !this.moved ) {
    			this.scroller._execEvent('scrollStart');
    		}

    		this.moved = true;

    		deltaX = point.pageX - this.lastPointX;
    		this.lastPointX = point.pageX;

    		deltaY = point.pageY - this.lastPointY;
    		this.lastPointY = point.pageY;

    		newX = this.x + deltaX;
    		newY = this.y + deltaY;

    		this._pos(newX, newY);

    // INSERT POINT: indicator._move

    		e.preventDefault();
    		e.stopPropagation();
    	},

    	_end: function (e) {
    		if ( !this.initiated ) {
    			return;
    		}

    		this.initiated = false;

    		e.preventDefault();
    		e.stopPropagation();

    		utils.removeEvent(window, 'touchmove', this);
    		utils.removeEvent(window, utils.prefixPointerEvent('pointermove'), this);
    		utils.removeEvent(window, 'mousemove', this);

    		if ( this.scroller.options.snap ) {
    			var snap = this.scroller._nearestSnap(this.scroller.x, this.scroller.y);

    			var time = this.options.snapSpeed || Math.max(
    					Math.max(
    						Math.min(Math.abs(this.scroller.x - snap.x), 1000),
    						Math.min(Math.abs(this.scroller.y - snap.y), 1000)
    					), 300);

    			if ( this.scroller.x != snap.x || this.scroller.y != snap.y ) {
    				this.scroller.directionX = 0;
    				this.scroller.directionY = 0;
    				this.scroller.currentPage = snap;
    				this.scroller.scrollTo(snap.x, snap.y, time, this.scroller.options.bounceEasing);
    			}
    		}

    		if ( this.moved ) {
    			this.scroller._execEvent('scrollEnd');
    		}
    	},

    	transitionTime: function (time) {
    		time = time || 0;
    		var durationProp = utils.style.transitionDuration;
    		this.indicatorStyle[durationProp] = time + 'ms';

    		if ( !time && utils.isBadAndroid ) {
    			this.indicatorStyle[durationProp] = '0.0001ms';
    			// remove 0.0001ms
    			var self = this;
    			rAF(function() {
    				if(self.indicatorStyle[durationProp] === '0.0001ms') {
    					self.indicatorStyle[durationProp] = '0s';
    				}
    			});
    		}
    	},

    	transitionTimingFunction: function (easing) {
    		this.indicatorStyle[utils.style.transitionTimingFunction] = easing;
    	},

    	refresh: function () {
    		this.transitionTime();

    		if ( this.options.listenX && !this.options.listenY ) {
    			this.indicatorStyle.display = this.scroller.hasHorizontalScroll ? 'block' : 'none';
    		} else if ( this.options.listenY && !this.options.listenX ) {
    			this.indicatorStyle.display = this.scroller.hasVerticalScroll ? 'block' : 'none';
    		} else {
    			this.indicatorStyle.display = this.scroller.hasHorizontalScroll || this.scroller.hasVerticalScroll ? 'block' : 'none';
    		}

    		if ( this.scroller.hasHorizontalScroll && this.scroller.hasVerticalScroll ) {
    			utils.addClass(this.wrapper, 'iScrollBothScrollbars');
    			utils.removeClass(this.wrapper, 'iScrollLoneScrollbar');

    			if ( this.options.defaultScrollbars && this.options.customStyle ) {
    				if ( this.options.listenX ) {
    					this.wrapper.style.right = '8px';
    				} else {
    					this.wrapper.style.bottom = '8px';
    				}
    			}
    		} else {
    			utils.removeClass(this.wrapper, 'iScrollBothScrollbars');
    			utils.addClass(this.wrapper, 'iScrollLoneScrollbar');

    			if ( this.options.defaultScrollbars && this.options.customStyle ) {
    				if ( this.options.listenX ) {
    					this.wrapper.style.right = '2px';
    				} else {
    					this.wrapper.style.bottom = '2px';
    				}
    			}
    		}

    		var r = this.wrapper.offsetHeight;	// force refresh

    		if ( this.options.listenX ) {
    			this.wrapperWidth = this.wrapper.clientWidth;
    			if ( this.options.resize ) {
    				this.indicatorWidth = Math.max(Math.round(this.wrapperWidth * this.wrapperWidth / (this.scroller.scrollerWidth || this.wrapperWidth || 1)), 8);
    				this.indicatorStyle.width = this.indicatorWidth + 'px';
    			} else {
    				this.indicatorWidth = this.indicator.clientWidth;
    			}

    			this.maxPosX = this.wrapperWidth - this.indicatorWidth;

    			if ( this.options.shrink == 'clip' ) {
    				this.minBoundaryX = -this.indicatorWidth + 8;
    				this.maxBoundaryX = this.wrapperWidth - 8;
    			} else {
    				this.minBoundaryX = 0;
    				this.maxBoundaryX = this.maxPosX;
    			}

    			this.sizeRatioX = this.options.speedRatioX || (this.scroller.maxScrollX && (this.maxPosX / this.scroller.maxScrollX));
    		}

    		if ( this.options.listenY ) {
    			this.wrapperHeight = this.wrapper.clientHeight;
    			if ( this.options.resize ) {
    				this.indicatorHeight = Math.max(Math.round(this.wrapperHeight * this.wrapperHeight / (this.scroller.scrollerHeight || this.wrapperHeight || 1)), 8);
    				this.indicatorStyle.height = this.indicatorHeight + 'px';
    			} else {
    				this.indicatorHeight = this.indicator.clientHeight;
    			}

    			this.maxPosY = this.wrapperHeight - this.indicatorHeight;

    			if ( this.options.shrink == 'clip' ) {
    				this.minBoundaryY = -this.indicatorHeight + 8;
    				this.maxBoundaryY = this.wrapperHeight - 8;
    			} else {
    				this.minBoundaryY = 0;
    				this.maxBoundaryY = this.maxPosY;
    			}

    			this.maxPosY = this.wrapperHeight - this.indicatorHeight;
    			this.sizeRatioY = this.options.speedRatioY || (this.scroller.maxScrollY && (this.maxPosY / this.scroller.maxScrollY));
    		}

    		this.updatePosition();
    	},

    	updatePosition: function () {
    		var x = this.options.listenX && Math.round(this.sizeRatioX * this.scroller.x) || 0,
    			y = this.options.listenY && Math.round(this.sizeRatioY * this.scroller.y) || 0;

    		if ( !this.options.ignoreBoundaries ) {
    			if ( x < this.minBoundaryX ) {
    				if ( this.options.shrink == 'scale' ) {
    					this.width = Math.max(this.indicatorWidth + x, 8);
    					this.indicatorStyle.width = this.width + 'px';
    				}
    				x = this.minBoundaryX;
    			} else if ( x > this.maxBoundaryX ) {
    				if ( this.options.shrink == 'scale' ) {
    					this.width = Math.max(this.indicatorWidth - (x - this.maxPosX), 8);
    					this.indicatorStyle.width = this.width + 'px';
    					x = this.maxPosX + this.indicatorWidth - this.width;
    				} else {
    					x = this.maxBoundaryX;
    				}
    			} else if ( this.options.shrink == 'scale' && this.width != this.indicatorWidth ) {
    				this.width = this.indicatorWidth;
    				this.indicatorStyle.width = this.width + 'px';
    			}

    			if ( y < this.minBoundaryY ) {
    				if ( this.options.shrink == 'scale' ) {
    					this.height = Math.max(this.indicatorHeight + y * 3, 8);
    					this.indicatorStyle.height = this.height + 'px';
    				}
    				y = this.minBoundaryY;
    			} else if ( y > this.maxBoundaryY ) {
    				if ( this.options.shrink == 'scale' ) {
    					this.height = Math.max(this.indicatorHeight - (y - this.maxPosY) * 3, 8);
    					this.indicatorStyle.height = this.height + 'px';
    					y = this.maxPosY + this.indicatorHeight - this.height;
    				} else {
    					y = this.maxBoundaryY;
    				}
    			} else if ( this.options.shrink == 'scale' && this.height != this.indicatorHeight ) {
    				this.height = this.indicatorHeight;
    				this.indicatorStyle.height = this.height + 'px';
    			}
    		}

    		this.x = x;
    		this.y = y;

    		if ( this.scroller.options.useTransform ) {
    			this.indicatorStyle[utils.style.transform] = 'translate(' + x + 'px,' + y + 'px)' + this.scroller.translateZ;
    		} else {
    			this.indicatorStyle.left = x + 'px';
    			this.indicatorStyle.top = y + 'px';
    		}
    	},

    	_pos: function (x, y) {
    		if ( x < 0 ) {
    			x = 0;
    		} else if ( x > this.maxPosX ) {
    			x = this.maxPosX;
    		}

    		if ( y < 0 ) {
    			y = 0;
    		} else if ( y > this.maxPosY ) {
    			y = this.maxPosY;
    		}

    		x = this.options.listenX ? Math.round(x / this.sizeRatioX) : this.scroller.x;
    		y = this.options.listenY ? Math.round(y / this.sizeRatioY) : this.scroller.y;

    		this.scroller.scrollTo(x, y);
    	},

    	fade: function (val, hold) {
    		if ( hold && !this.visible ) {
    			return;
    		}

    		clearTimeout(this.fadeTimeout);
    		this.fadeTimeout = null;

    		var time = val ? 250 : 500,
    			delay = val ? 0 : 300;

    		val = val ? '1' : '0';

    		this.wrapperStyle[utils.style.transitionDuration] = time + 'ms';

    		this.fadeTimeout = setTimeout((function (val) {
    			this.wrapperStyle.opacity = val;
    			this.visible = +val;
    		}).bind(this, val), delay);
    	}
    };

    IScroll.utils = utils;

    /* !!! 原文件修改处 */
    return function(el, option) {
        return new IScroll(el, option);
    }
})(window, document, Math);


/* 尝试绑定方法到 magic 框架的全局对象上 */
if ($ && $.fn && !$.fn.scroll) {
    $.fn.extend({scroll: function(option) {
        var handle, probe, $el = this.children();     // 存储scroll对象

        probe = (option && (typeof option.pullRefreshUp == "function" ||
        typeof option.pullRefreshDown == "function")) ? 3 : null;

        option = $.extend({
            bindToWrapper : true,
            scrollbars    : true,
            probeType     : 2,
            preventDefault: false,
            refresh       : false,
            mouseWheel    : true,
        }, option);

        if (option && option.mode == "desktop") {
            option = $.extend({
                fadeScrollbars: false,
            }, option);
        } else {
            option = $.extend({
                fadeScrollbars: true,
            }, option);
        }

        handle = new scroll(this[0], option);

        if (probe === 3 /* 设置下拉刷新 */) {
            var ispull, defer, $pup, $pdown,
                $text, finish, starty,
                callup   = option.pullRefreshUp,
                calldown = option.pullRefreshDown;

            if (calldown /* 添加下拉刷新提示框 */) {
                $pdown = $el.find(".scroll_pullDown");
            }

            if (callup /* 添加上拉刷新提示框 */) {
                $pup = $el.find(".scroll_pullUp");
            }

            finish = function(istrue, norefresh, reset) {
                if (!reset /* 非重置模式再修改 */) {
                    if (istrue === false) {
                        $text.text("刷新失败");
                    } else {
                        $text.text("刷新成功");
                    }
                }

                setTimeout(function() {
                    handle.minScrollY = 0;
                    handle.maxScrollY = handle.wrapperHeight - handle.scrollerHeight;

                    $text   && $text.text("释放刷新内容");
                    // 非 reset 重置状态情况下，默认刷新页面
                    !reset && !norefresh && handle.refresh();
                    // 非 reset 重置状态情况下，重设位置
                    !reset && handle.resetPosition(handle.options.bounceTime);
                    defer = null;               // 释放内存
                }, reset ? 0 : 600);
            }

            $el.on("touchstart", function() {
                starty = handle.y;      // 记录起始位置

                if (!defer && (Math.abs(starty-10) <= 10 ||
                    Math.abs(starty-handle.maxScrollY) <= 10)) {
                    ispull = true;      // 当前为下拉刷新状态
                    defer = $.defer(); defer.then(finish);
                } else {
                    ispull = false;
                }

                scrolling = true;
            }).on("touchend", function() {
                if (!ispull) {
                    finish(null, null, true);   // 触发失败则重置

                    return false;   // 不满足下拉动作中止程序
                }

                var posy = handle.y, dir = handle.directionY,
                    maxy = handle.wrapperHeight - handle.scrollerHeight,
                    sph = 0, dirup = false, dirdown = false;

                if ($pdown && $pdown[0]) {
                    sph = $pdown.height();
                    dirdown = true;
                } else if ($pup && $pup[0]) {
                    sph = $pup.height();
                    dirup = true;
                }

                if (dirdown && dir == -1 && posy >= sph) {
                    handle.minScrollY = sph;        // 刷新提示定位修复

                    $text = $pdown.find(".text").text("内容刷新中...");
                    calldown && calldown(defer);    // 尝试执行下拉回调
                } else if (dirup && posy <= (maxy-sph)) {
                    handle.maxScrollY = maxy-sph;   // 刷新提示定位修复

                    $text = $pup.find(".text").text("内容刷新中...");
                    callup   && callup(defer);      // 尝试执行上拉回调
                } else {
                    finish(null, null, true);       // 触发失败则重置
                }

                ispull = false;                     // 重置下拉状态
            })

            handle.on("scroll", function() {
                if (!ispull) return false;  // 非下拉状态直接退出

                var posy = handle.y, dir = handle.directionY;

                if (dir == 1 && Math.abs(starty) <= 10) {
                    ispull = false;     // 修复首次下滚判断错误问题
                    defer  = null;      // 清除defer句柄
                }
            })
        }

        if (option.refresh) {
            var $body = $el, last = 0,
                bind  = option.refresh === "true" ? "on" : "once";

            $el.parent()[bind]("touchstart", function() {
                var height = $body.height();
                if (height != last) {
                    handle.refresh();      // 强制刷新高度
                    last = height;          // 更新内容高度
                }
            })
        }

        return this.data("ui_scroll", handle);
    }})
};
